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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v = 13/17 // - 13/17
6/v-(13/17) = 0
6/v-13/17 = 0
6*v^-1 = 13/17 // : 6
v^-1 = 13/102
-1 < 0
1/(v^1) = 13/102 // * v^1
1 = 13/102*v^1 // : 13/102
102/13 = v^1
v = 102/13
v = 102/13
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